In honour of the 15th Anniversary of 9/11, National Geographic Channel is looking back at the very best reporting we have done since this world-changing tragedy first happened using extended excerpts from past specials that relate directly to events leading up to and following the attacks on New York City and Washington DC.

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A feature-length documentary which examines a deeply disturbing episode in Canadian history, when an impoverished couple was coerced by undercover law enforcement agents into carrying out a terrorist bombing. Further, viewers learn that this case is far from unique in the context of Canadian intelligence.

An intrepid archeology professor and his team of students are the only ones who stand in the way of an ISIS illicit antiquities network. Faced with losing their cultural heritage they become spies and they go undercover in ISIS territory. They dodge bombs and militia to create a system to monitor theft and destruction of Syrian antiquities. During this process, they discover more than they anticipated, discovering thousands of trafficked items and that the crimes committed are being enabled by terrorists and multinational corporations. The tragedy continues because the sale of illegal goods are uncovered in the most unsuspecting place.

August 29, 1979, Talavera Bruce Penal Institute, Bangu, Rio de Janeiro. After serving eight years in prison, Inês Etienne Romeu, the only survivor of the "House of Death" in Petrópolis and the first political prisoner sentenced to life in prison in Brazil, left prison benefiting from Amnesty. Norma Bengell filmed this moment: from the prison door to her home with her family, Inês was welcomed by family, friends and members of the Brazilian Amnesty Committee, in what marked the first act of the historic denunciation that Inês would carry out against her tormentors and the Military Regime.

Immediately after the Boston Marathon bombing in April 2013, amateur detectives took the Internet chat rooms to try to find the culprits, looking for details in photographs uploaded to the sites that could point to the guilt of potential suspects.

The murder of Dutch filmmaker Theo van Gogh by an Islamic extremist in 2004, followed by the publishing of twelve satirical cartoons depicting the prophet Mohammed that was commissioned for the Danish newspaper Jyllands-Posten, provides the incendiary framework for Daniel Leconte's provocative documentary, It's Hard Being Loved by Jerks.

Since the start of Operation Iron Sword, provoked by Hamas’ attack on Israel, conditions in Gaza have become apocalyptic. After months of offensive, most of the territory is an uninhabitable field of ruins. 1.5 million people are displaced, forced to constantly relocate by the advancing Israeli army. Barely a third of the hospitals are functioning. According to Unicef estimates, a child is injured or killed every 10 minutes in Gaza.

Over the course of two years, filmmaker Jamie Roberts meets those spreading extremist Islamic fundamentalism in Britain, including a bouncy castle salesman who is now one of the world's most wanted men.

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A unique interview with Tooba Gondal, the woman who groomed and lured scores of Western women to join ISIS. Using social media, she became a deadly matchmaker, recruiting a number of high-profile “jihadi brides” for ISIS militants in Syria: she allegedly helped organise the transporting of three British schoolgirls, including Shamima Begum, to Syria.

An attempt to create a bridge between the different political positions that coexist, sometimes violently, in the Basque Country, in northern Spain.